Pen cap assembly
By designing a pen cap assembly with an elastic arm, a ring-shaped cylinder, and a claw structure on the automatic injection pen, the problems of unexpected pen cap detachment and contamination risk are solved, achieving safety and preventing secondary use of the automatic injection pen.
Patent Information
- Application Number
- CN202423115841.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-17
AI Technical Summary
The existing automatic injection pen cap assembly has an unreasonable structural design, which makes it easy for it to detach unexpectedly, leading to the risk of needle contamination and failing to prevent reuse.
Design a pen cap assembly including a flexible arm, an annular cylinder, and a claw structure to ensure that the pen cap assembly cannot be reinstalled on an automatic injection pen. Limiting elements and baffles prevent the needle protective cap from falling off, thereby enhancing assembly safety.
It effectively prevents the reuse of automatic injection pens, reduces the risk of needle contamination, and improves the assembly and usage safety of the pen cap assembly.
Smart Images
Figure CN223901046U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of medical apparatus and instruments, and particularly relates to a pen cap assembly of an automatic injection pen. BACKGROUND
[0002] With the renewal iteration of science and technology and the improvement of requirements of patients on medical apparatus and instruments, the automatic injection pen is increasingly becoming the first choice of patients. Patients hope that the automatic injection pen is easy to operate and high in safety. In the use process of the automatic injection pen, feedback prompts can be provided to the patients to provide injection process signals, so that the patients can control the injection process in real time, reduce injection anxiety, and improve safety.
[0003] In addition to improving the structure of the driving assembly and the shell assembly to ensure that the parts are assembled perfectly and improve safety, the structure of the pen cap assembly must also be improved to avoid the separation of the pen cap assembly in an unintended state and the risk of contamination of the needle after separation.
[0004] Generally, the unreasonable structure design of the pen cap assembly can cause unintended separation, which can cause the needle to be exposed to the environment, increasing the risk of contamination of the needle. Therefore, the pen cap assembly of the automatic injection pen needs to be improved to improve the safety of the pen cap assembly. SUMMARY
[0005] The application provides a pen cap assembly packaged at the injection end of an automatic injection pen. The pen cap assembly cannot be packaged in the automatic injection pen again after being removed from the automatic injection pen, effectively preventing the secondary use of the automatic injection pen and the contamination of the needle. In addition, the structure design of the pen cap assembly enhances the assembly performance of the pen cap assembly and the main body of the automatic injection pen, reduces the unintended separation of the pen cap assembly, and improves the assembly safety of the parts in the pen cap assembly.
[0006] To solve the above technical problems, one technical scheme of the application is as follows: a pen cap assembly is packaged at the proximal end of an automatic injection pen and includes a pen cap main body. The pen cap main body has an elastic arm with a first limiting surface. When the first limiting surface abuts against a first matching surface of a protective sleeve of the automatic injection pen, the first limiting surface is used to limit the pen cap assembly from being packaged again at the proximal end of the automatic injection pen. The proximal end is the end close to the patient.
[0007] As an embodiment, the pen cap assembly further includes a ring-shaped cylinder nested in the interior of the pen cap main body. The pen cap main body is provided with a limiting piece for limiting the limit position of the ring-shaped cylinder. The ring-shaped cylinder is provided with a baffle for blocking the needle protection cap of the packaged needle from falling off the ring-shaped cylinder.
[0008] As an embodiment, the annular barrel of the cap assembly is provided with a clamping groove matched with the boss of the cap body; the boss is arranged on the inner surface of the cap body and protrudes towards the side close to the axis of the cap body, and the clamping groove is an opening arranged in the circumferential direction of the annular barrel.
[0009] As an embodiment, one end of the annular barrel of the cap assembly is provided with a clamping jaw, which is deformed towards the side close to the axis of the annular barrel for disassembling the needle protection cap for encapsulating the needle; the clamping jaw is annularly arranged in the circumferential direction and connected to the annular barrel at one end, and the other end is a free end extending towards the proximal end of the annular barrel, and the clamping jaw is elastically deformable.
[0010] As an embodiment, the elastic arm further has a second limiting surface matched with a second matching surface of the protective sleeve; when the cap assembly is removed from the proximal end of the automatic injection pen, the elastic arm moves along the second matching surface, and the second matching surface provides a guide for the elastic arm.
[0011] As an embodiment, the cap body includes an inner body and an outer body, and the elastic arm is arranged on the inner body and deformed towards the side close to the outer body, and the protective sleeve is located between the inner body and the outer body.
[0012] As an embodiment, the boss is a wedge-shaped structure, one end of the boss away from the proximal end is an inclined surface, and the other end of the boss close to the proximal end is a vertical surface; the inclined surface provides a guide for the annular barrel to be matched with the cap body when the annular barrel is installed on the cap body, and the vertical surface is used to block the annular barrel from being separated from the cap body after the annular barrel is installed on the cap body.
[0013] As an embodiment, the blocking piece is provided with at least two groups, and each adjacent two blocking pieces in any one group are discontinuously arranged to form a gap, and the annular barrel has a limited movable distance; when the gap abuts against the limiting piece, the annular barrel has a first limit position.
[0014] As an embodiment, when the clamping groove abuts against the vertical surface, the annular barrel has a second limit position.
[0015] As an embodiment, the annular barrel has a cantilever, the cantilever extends in the axial direction of the annular barrel and the axial length of the cantilever is less than the axial length of the annular barrel, and the clamping groove is arranged on the cantilever.
[0016] The beneficial effects of the present application are: different from the prior art, the cap assembly of the automatic injection pen provided by the present application can effectively prevent the secondary use of the automatic injection pen, prevent the cap assembly from being re-encapsulated on the automatic injection pen after the needle is exposed, reduce the pollution risk, and improve the safety of the automatic injection pen; in addition, the structural design of each part of the cap assembly can improve the assembly safety between them and effectively improve the performance of the cap assembly. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1is a structural schematic diagram of an embodiment of the cap assembly provided in the present application;
[0018] Figure 2 is a cross-sectional structural schematic diagram of an assembly relationship of an embodiment of the cap assembly and the automatic injection pen in an initial state provided in the present application;
[0019] Figure 3 is a cross-sectional structural schematic diagram of an assembly of an embodiment of the cap assembly and the automatic injection pen in an end-of-injection state provided in the present application;
[0020] Figure 4 is an angle cross-sectional structural schematic diagram of an embodiment of the cap assembly provided in the present application;
[0021] Figure 5 is another angle cross-sectional structural schematic diagram of an embodiment of the cap assembly provided in the present application;
[0022] Figure 6 is a ring cylinder structural schematic diagram of an embodiment of the cap assembly provided in the present application. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.
[0024] The terms “first”, “second”, and the like in the present application are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present application, the meaning of “several” and “a plurality of” is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.
[0025] In the present application, the phrase “embodiment” means that the specific features, structures or properties described in combination with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.
[0026] The cap assembly is packaged at the proximal end of the automatic injection pen when the automatic injection pen is in the initial state, the proximal end being the injection end close to the patient, and the distal end being the end away from the patient; when the injection needs to be started, the cap assembly is removed from the injection end of the automatic injection pen, the protective sleeve of the automatic injection pen is placed at the injection site of the patient's skin, the automatic injection pen is pressed, the protective sleeve moves to the distal end and is retracted into the automatic injection pen, and the automatic injection pen starts the injection and drives the liquid medicine to be injected into the injection site.
[0027] Please refer to Figure 3 In one aspect of the present application, a cap assembly 10 is provided, which is packaged at the proximal end of the automatic injection pen, comprising a cap body 100, the cap body 100 having a resilient arm 105, the resilient arm 105 having a first limiting surface 1051; the automatic injection pen comprises a protective sleeve 20, the protective sleeve 20 having a first matching surface 21, the first limiting surface 1051 being used to limit the re-packaging of the cap assembly 10 to the proximal end of the automatic injection pen when the first limiting surface 1051 abuts against the first matching surface 21 of the protective sleeve 20.
[0028] Specifically, the automatic injection pen is designed as a disposable device, which is discarded after use and cannot be used again, and the needle is exposed after the cap assembly 10 is removed, which causes a pollution risk. Therefore, the cap assembly cannot be re-packaged in the automatic injection pen. Based on this, the cap assembly 10 is designed to have a corresponding structure, which cannot be re-packaged in the automatic injection pen after the cap assembly 10 is removed from the automatic injection pen. In the embodiments of the present application, see Figure 2 and Figure 3 The resilient arm 105 is provided inside the cap body 100 and has a certain degree of deformation. The resilient arm 105 can deform inwardly or recover the deformation under the limiting or unlimiting condition of the protective sleeve 20. In the initial state, the resilient arm 105 deforms inwardly under the limitation of the protective sleeve 20; after the cap assembly 10 is removed, the resilient arm 105 recovers the deformation by escaping from the limitation of the protective sleeve 20. When the cap assembly 10 is again attempted to be packaged at the proximal end of the automatic injection pen, the first limiting surface 1051 of the resilient arm 105 is blocked by the first matching surface 21 of the protective sleeve 20 and cannot move to the distal end, so that the cap assembly 10 cannot be re-packaged in the automatic injection pen. This design can ensure that the automatic injection pen cannot be used again, warn the patient not to arbitrarily disassemble the cap assembly 10, and reduce the pollution risk of the automatic injection pen.
[0029] The elastic arm 105 has a plurality of inclined surfaces, the first limiting surface 1051 is an inclined surface arranged on the elastic arm 105 close to the distal end. The protective sleeve 20 is nested on the outer periphery of the elastic arm 105, and the proximal end of the protective sleeve 20 is a hollow cylindrical structure, and the first matching surface 21 is an inclined surface arranged on the proximal end of the protective sleeve 20. When the cap assembly 10 is assembled again on the protective sleeve 20 of the automatic injection pen from the proximal end, the first limiting surface 1051 is blocked by the first matching surface 21, so that the cap assembly 10 cannot continue to move to the distal end, and the cap assembly 10 cannot be installed again.
[0030] In the above embodiment, the elastic arm 105 also has a second limiting surface 1052, which cooperates with the second matching surface 22 of the protective sleeve 20. When the cap assembly 10 is removed from the proximal end of the automatic injection pen, the elastic arm 105 moves along the second matching surface 22, and the second matching surface 22 provides a guide for the elastic arm 105. Specifically, referring to Figure 2 , the elastic arm 105 is provided with the second limiting surface 1052 close to the proximal end, and the inclination direction of the second limiting surface 1052 is the same as that of the first limiting surface 1051; the protective sleeve 20 is also provided with the second matching surface 22, which is an inclined surface arranged on the inner surface of the protective sleeve 20, and the second matching surface 22 is closer to the distal end of the protective sleeve 20 than the first matching surface 21. In the initial state, i.e. before the automatic injection pen is started, the elastic arm 105 is limited to deform inwardly by the protective sleeve 20, and the second limiting surface 1052 and the second matching surface 22 are adapted to abut. When the automatic injection pen needs to be started, a force is applied to the cap assembly 10 towards the proximal end, and the elastic arm 105 is subjected to a proximal force, and has a component on the second limiting surface 1052, which is sufficient to overcome the friction between the second limiting surface 1052 and the second matching surface 22, so that the elastic arm 105 moves along the second matching surface 22, and the second matching surface 22 provides a guide for the elastic arm 105.
[0031] In the embodiments of the present application, please refer to Figure 1 , Figure 4 and Figure 5, the cap assembly 10 further comprises a ring-shaped cylinder 200 nested inside the cap body 100, and the cap body 100 is provided with a limiting piece 104 at the proximal end for limiting the extreme position of the ring-shaped cylinder 200. Specifically, the inner surface of the side of the cap body 100 close to the proximal end protrudes a block-shaped protrusion to one side of the axis of the cap body 100. In this embodiment, the block-shaped protrusion is in the shape of a regular cuboid, and in other embodiments, it can also be in the shape of a cylinder, a sphere, etc. The ring-shaped cylinder 200 is coaxially nested inside the cap body 100, and when the ring-shaped cylinder 200 moves to the position of the limiting piece 104, it is blocked by the limiting piece 104 and cannot continue to move proximally. The limiting piece 104 limits the extreme position of the ring-shaped cylinder 200, so that the ring-shaped cylinder 200 cannot be detached from the proximal end of the cap assembly 10, thereby improving the safety of the cap assembly 10.
[0032] Continuing to refer to Figure 4 and Figure 5 , the ring-shaped cylinder 200 is provided with a baffle 203 at the side close to the proximal end for blocking the needle protection cap 30 from falling off the side close to the proximal end of the ring-shaped cylinder 200. Specifically, the needle protection cap 30 is coaxially nested inside the ring-shaped cylinder 200, and the needle protection cap 30 cannot move distally due to the intervention of a specific structure, but there is a possibility of moving proximally. Therefore, the provision of the baffle 203 at the side close to the proximal end of the ring-shaped cylinder 200 can reduce the risk of the needle protection cap 30 falling off the proximal end of the ring-shaped cylinder 200, thereby improving the safety of the cap assembly 10.
[0033] In one embodiment, the ring-shaped cylinder 200 of the cap assembly 10 is provided with a clamping groove 201 matched with the boss 103 of the cap body 100; the boss 103 is provided on the inner surface of the cap body 100 and protrudes to one side close to the axis of the cap body 100, and the clamping groove 201 is an opening provided on the circumference of the ring-shaped cylinder 200, and the boss 103 is adaptively clamped in the clamping groove 201. Specifically, the ring-shaped cylinder 200 is coaxially nested inside the cap body 100 and integrally packaged in the injection end of the automatic injection pen after being clamped and connected with the cap body 100. The boss 103 is provided on the inner surface of the cap body 100 and clamped in the clamping groove 201, which on one hand connects the cap body 100 and the ring-shaped cylinder 200 together, and on the other hand, the clamping groove 201 can provide a space for the boss 103 to move, so that the cap body 100 and the ring-shaped cylinder 200 can move relatively. When the automatic injection pen falls and collides, the space of the clamping groove 201 can make the ring-shaped cylinder 200 move relatively to the cap body 100 to relieve the impact force of the fall, so that the cap body 100 does not fall off the injection end of the automatic injection pen to cause accidental triggering.
[0034] In the embodiment of the present application, the one end of the annular barrel 200 is provided with a claw 202, and the claw 202 is deformed towards the side close to the axis of the annular barrel 200 for disassembling the needle protection cap 30 of the needle. Specifically, one end of the claw 202 is connected to the barrel body of the annular barrel 200, and the other end is a free end which is deformed towards the inside of the annular barrel 200. The needle protection cap 30 is a cylindrical cover with an open end, coaxially nested inside the annular barrel 200 and covering the needle. Generally, the needle protection cap 30 is provided as a soft cover. The free end of the claw 202 is clamped and abuts against the outer peripheral surface of the needle protection cap 30, and the needle protection cap 30 is in interference fit to form a clamping force. When the pen cap assembly 10 needs to be pulled out, a force is applied to the pen cap assembly 10 towards the proximal end, which makes the pen cap body 100 and the annular barrel 200 move towards the proximal end or have a tendency to move towards the proximal end. The clamping force between the free end of the claw 202 and the needle protection cap 30 will bring the needle protection cap 30 down together, exposing the needle.
[0035] In the present application, the claw 202 is arranged in a ring shape along the circumferential direction and connected to the distal end of the annular barrel 200 at one end and extends towards the proximal end of the annular barrel 200 at the other end. The claw 202 is elastically deformable. Referring to the drawings, Figure 4 、 5 It can be seen that a plurality of through holes 204 are provided on the distal end side of the annular barrel 200, and the through holes 204 are arranged in a ring shape along the circumferential direction of the annular barrel 200. One end of the claw 202 is connected to the distal end face of the through hole 204, and the other end extends towards the proximal end. One end of the claw 202 is fixed, and the other end is a free end which is deformed towards the side close to the axis of the annular barrel 200. The claw 202 clamps the needle protection cap 30 inwardly, and the clamping force between the claw 202 and the needle protection cap 30 makes the needle protection cap 30 exposed from the needle. The claw 202 and the annular barrel 200 are made of the same material, which is optionally a metal material. The greater the degree of inward deformation of the claw 202, the greater the clamping force between the claw 202 and the needle protection cap 30, and the easier the needle protection cap 30 is disassembled from the needle. The degree of deformation of the claw 202 can be adjusted according to the clamping force.
[0036] Optionally, the annular barrel 200 is a metal pipe, and the clamping groove 201 and the claw 202 on the annular barrel 200 are formed by cutting process. The cutting process of the whole pipe is more stable in performance than the process of rolling a sheet into a pipe, which is more conducive to disassembling the needle protection cap 30 and does not have the risk of deformation and fracture.
[0037] In the above embodiment, when the cap assembly 10 is pulled off towards the proximal end, the clamping force between the pawl 202 and the needle protection cap 30 causes the pawl 202 to move the needle protection cap 30 towards the proximal end until the needle is exposed. After the needle protection cap 30 is completely separated from the needle, due to the specific clamping direction of the pawl 202, the needle protection cap 30 cannot move towards the distal end, but can continue to move towards the proximal end, i.e. towards the end away from the pawl 202, so that the needle protection cap 30 has the risk of being separated from the proximal end of the annular barrel 200. The barrel body at the end of the annular barrel 200 away from the pawl 202 is provided with a baffle 203, which can block the needle protection cap 30 when it moves towards the end away from the pawl 202, preventing it from falling off and improving the safety of the cap assembly 10.
[0038] In this application, referring to Figure 4 , the cap body 100 includes an inner body 102 and an outer body 101, and the elastic arm 105 is arranged on the inner body 102 and deformed towards the side close to the outer body 101, and the protective sleeve 20 is located between the inner body 102 and the outer body 101. Specifically, the cap body 100 includes an inner body 102 and an outer body 101, the inner body 102 is coaxially nested inside the outer body 101, the inner body 102 and the outer body 101 are fixedly arranged at the proximal end side of the cap body 100, and at the distal end side of the cap body 100, the axial length of the inner body 102 is greater than the axial length of the outer body 101, i.e. the inner body 102 extends axially beyond the outer body 101. Radially, the outer diameter of the inner body 102 is smaller than the inner diameter of the outer body 101, i.e. there is a space between the outer surface of the inner body 102 and the inner surface of the outer body 101, which is used to accommodate the protective sleeve 20 of the automatic injection pen.
[0039] In the above embodiment, the boss 103 is arranged on the inner surface of the inner body 102 and protrudes towards the side close to the axis of the inner body 102, and the annular barrel 200 is coaxially nested inside the inner body 102, and the clamping groove 201 is arranged in the circumferential direction of the annular barrel 200, and is arranged in an open shape, which is not limited to a rectangle, a square or other shapes. The clamping groove 201 is arranged through the barrel body of the annular barrel 200, i.e. through the inner surface and the outer surface of the annular barrel 200. Generally, the boss 103 is provided with at least two, which are axially symmetrical with respect to the inner body 102; the clamping groove 201 is provided with at least two, which are axially symmetrical with respect to the annular barrel 200. In the embodiment of the present application, the boss 103 and the clamping groove 201 are both provided with two.
[0040] In the above embodiment, the boss 103 is designed as a wedge-shaped structure, one end of the boss 103 away from the proximal end of the cap body 100 is an inclined surface 1031, and the other end of the boss 103 close to the proximal end of the cap body 100 is a vertical surface 1032; the inclined surface 1031 provides guidance when the annular barrel 200 is installed on the cap body 100 to enable the annular barrel 200 to be assembled with the cap body 100, and the vertical surface 1032 is used to prevent the annular barrel 200 from being separated from the cap body 100 after the annular barrel 200 is installed on the cap body 100.
[0041] Specifically, the annular barrel 200 is assembled from the side away from the proximal end of the cap body 100, and the annular barrel 200 is inserted into the inner body 102. The annular barrel 200 moves towards the proximal end along the inclined surface 1031 of the boss 103, and the inclined surface 1031 provides guidance for the installation of the annular barrel 200. When the annular barrel 200 passes over the inclined surface 1031, the boss 103 is completely engaged inside the clamping groove 201, i.e. the assembly of the annular barrel 200 and the cap body 100 is completed.
[0042] In the above embodiment, the stopper 203 is provided with at least two groups, and any two adjacent stoppers 203 in each group are discontinuously arranged to form a gap 205, and the annular barrel 200 has a limited movable distance; when the gap 205 abuts against the limiting piece 104, the annular barrel 200 has a first limit position; when the clamping groove 201 abuts against the vertical surface 1032, the annular barrel 200 has a second limit position.
[0043] Specifically, please refer to Figure 5 , 6 As shown in the drawings, one end of the stopper 203 is connected to the barrel of the annular barrel 200 away from the clamping jaw 202, and the other end is a free end; the stopper 203 is arranged perpendicular to the axis of the annular barrel 200. Specifically, the clamping jaw 202 is arranged on the side of the annular barrel 200 close to the distal end, and the stopper 203 is arranged on the side of the annular barrel 200 close to the proximal end and perpendicular to the axial extension direction of the annular barrel 200, i.e. the stopper 203 is a sheet-shaped structure bent in a direction perpendicular to the axis of the annular barrel 200, and it extends in the radial direction. In this embodiment, continuing to refer to Figure 6 As shown in the drawings, the stopper 203 is provided with two groups, the first group of stoppers 203 and the second group of stoppers 203 are axially symmetrical relative to the annular barrel 200, the first group of stoppers 203 and the second group of stoppers 203 are arranged opposite to each other, and the sum of the radial lengths of the two groups of stoppers 203 in the radial direction is not greater than the inner diameter of the annular barrel 200; when the sum of the radial lengths of the two groups of stoppers 203 is less than the inner diameter of the annular barrel 200, the radial distance between the two groups of stoppers 203 should be less than the inner diameter of the needle protection cap 30, so as to limit the needle protection cap 30 and prevent the needle protection cap 30 from falling off from the proximal end of the annular barrel 200.
[0044] Continuing to refer to Figure 6In this embodiment, the annular barrel 200 is provided with two groups of baffles 203, each group is provided with two baffles 203, and each adjacent two baffles 203 in any group is discontinuously arranged to form a gap 205. In other embodiments, three groups, four groups, five groups, …, or the like can be provided, and two adjacent baffles 203 in any group can be discontinuously arranged to form a gap 205; alternatively, at least two adjacent baffles 203 in any group can be discontinuously arranged to form a gap 205, and in other embodiments, two adjacent baffles 203 can be continuously arranged without a gap 205. For example, in an embodiment, the annular barrel 200 is provided with three groups of baffles 203, one group of baffles 203 is provided with three baffles 203, two adjacent baffles 203 are provided with a gap 205, and the other two adjacent baffles 203 are not provided with a gap 205. In short, as long as the position of the limiting piece 104 corresponds to the position of the gap 205, the limiting effect of the cap body 100 on the annular barrel 200 can be achieved.
[0045] After the annular barrel 200 and the cap body 100 are assembled, the annular barrel 200 has a limited movable distance. That is, relative to the cap body 100, the annular barrel 200 has a certain range of relative movement distance; and relative to the annular barrel 200, the cap body 100 has a certain range of relative movement distance. In this embodiment, the movement of the annular barrel 200 is described with reference to the cap body 100. When the gap 205 abuts against the limiting piece 104, the annular barrel 200 has a first limit position; when the clamping groove 201 abuts against the vertical surface 1032, the annular barrel 200 has a second limit position.
[0046] Specifically, the clamping groove 201 has a first end surface 2011 and a second end surface 2012, and the first end surface 2011 is closer to the proximal end side of the annular barrel 200 than the second end surface 2012. After the annular barrel 200 and the cap body 100 are assembled, the annular barrel 200 has a limited movable distance, that is, the annular barrel 200 has a first limit position and a second limit position, and the annular barrel 200 is closer to the proximal end side when it is at the first limit position than when it is at the second limit position. Specifically, when the annular barrel 200 moves to the proximal end side, the gap 205 of the annular barrel 200 abuts against the limiting piece 104 of the cap body 100, and the gap 205 is blocked by the limiting piece 104 so that the annular barrel 200 cannot move to the proximal end side any more, at this time, the annular barrel 200 is at the first limit position. When the annular barrel 200 moves to the distal end side, the first end surface 2011 of the clamping groove 201 abuts against the vertical surface 1032 of the boss 103, and the first end surface 2011 is blocked by the vertical surface 1032 so that the annular barrel 200 cannot move to the distal end side any more, at this time, the annular barrel 200 is at the second limit position.
[0047] In the above embodiment, the annular barrel 200 has a cantilever 206 extending axially along the annular barrel 200 and having an axial length smaller than that of the annular barrel 200, and the clamping slot 201 is arranged on the cantilever 206. Specifically, in the above embodiment, referring to Figure 6 The cantilever 206 is arranged circumferentially staggered with the two groups of blocking pieces 203, and has an axial length smaller than that of the main body of the annular barrel 200, which is convenient for the implementation of the cutting process and takes into account the assembly relationship between the annular barrel 200 and the cap main body 100 and the design of the positions of the blocking pieces 203 and the like, so as to maximize the functions of the various components. The cantilever 206 is provided with an opening, which is the clamping slot 201 adapted to be clamped with the boss 103.
[0048] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the different embodiments or examples described in the present specification and the features of the different embodiments or examples can be combined and combined by those skilled in the art without contradiction.
[0049] The above is only the embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.
Claims
1. A cap assembly for enclosing the proximal end of an automatic injection pen comprising a cap body, characterised in that, The cap body has a resilient arm with a first limiting surface for limiting the cap assembly from being re-packaged to the proximal end of the auto-injector when the first limiting surface abuts against a first mating surface of the protective sleeve of the auto-injector. Proximal end refers to the end closer to the patient.
2. The cap assembly of claim 1, wherein The cap assembly further comprises a ring-shaped barrel nested inside the cap body, the cap body is provided with a limiting member for limiting the extreme position of the ring-shaped barrel; the ring-shaped barrel is provided with a blocking sheet for blocking the needle protection cap of the packaged needle from falling off the ring-shaped barrel.
3. A cap assembly according to claim 1 or 2, wherein The ring-shaped barrel of the cap assembly is provided with a clamping groove matched with a boss of the cap body; the boss is arranged on the inner surface of the cap body and protrudes towards the side close to the axis of the cap body, and the clamping groove is an opening arranged in the circumferential direction of the ring-shaped barrel.
4. The cap assembly of claim 1 or 2, wherein One end of the ring-shaped barrel of the cap assembly is provided with a clamping jaw deformed towards the side close to the axis of the ring-shaped barrel for disassembling the needle protection cap of the packaged needle; the clamping jaw is arranged in a ring shape in the circumferential direction and connected to the ring-shaped barrel at one end, and the other end is a free end extending towards the proximal end of the ring-shaped barrel, and the clamping jaw is elastically deformable.
5. The cap assembly of claim 1, wherein The resilient arm further has a second limiting surface matched with a second mating surface of the protective sleeve, and when the cap assembly is removed from the proximal end of the auto-injector, the resilient arm moves along the second mating surface, and the second mating surface provides a guide for the resilient arm.
6. The cap assembly of claim 1, wherein The cap body comprises an inner body and an outer body, the resilient arm is arranged on the inner body and deformed towards the side close to the outer body, and the protective sleeve is located between the inner body and the outer body.
7. The cap assembly of claim 3, wherein The boss is in a wedge-shaped structure, one end of the boss away from the proximal end is an inclined surface, and one end of the boss close to the proximal end is a vertical surface; the inclined surface provides a guide for the ring-shaped barrel and the cap body when the ring-shaped barrel is installed on the cap body, and the vertical surface is used to block the ring-shaped barrel from being separated from the cap body after the ring-shaped barrel is installed on the cap body.
8. The cap assembly of claim 2, wherein The blocking sheet is provided with at least two groups, and each adjacent two blocking sheets in any group are discontinuously arranged to form a gap, and the ring-shaped barrel has a limited movable distance; when the gap abuts against the limiting member, the ring-shaped barrel has a first extreme position.
9. The cap assembly of claim 7, wherein When the clamping groove abuts against the vertical surface, the ring-shaped barrel has a second extreme position.
10. The cap assembly of claim 3, wherein The ring-shaped barrel has a cantilever extending in the axial direction of the ring-shaped barrel and having an axial length smaller than that of the ring-shaped barrel, and the clamping groove is arranged on the cantilever.